Grinding machine and method.



JONES. GRINIIIIG MACHINE AND METHOD.

APPLICATION FILED AUGfS ISIBn Z SHEETS-SHEET I.

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n. JONES'. I GRNDING NIAGHINE ANDMETHOD.

' APPLlCATlQlN FILED AUG3 1918.

Patented Jan. T, 1919.

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GIRINDING MACHNE AND METHD ASpecfication of Letters atent.

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Application tiled August 3, 1918, Serial No. 248,123.

, To aZZ whom it may conce/m I Be it known that l, Buscar B. Jours, citizen of the United States of America, and

.coperating stone roll forluse in pulverizingr materials such `as chocolate.

rlhe motar 1s concave on its upper side, the concave surface being substantially cylindrical and having; corrugations extending in `the direction of the cylindrical curvature.

The roll has corrugations around the pe .riphery thereof in planes perpendicular to the axis of the roll, the corrugations on the roll being adapted to register with the corru- ,rrations inthe block. ln ,frrindine` materials such as chocolate the roller is rolled backv and. forth over the block with its corrugations intermeshing with thel corrugations in the block.

The principal object of the present invention is to grind pairs of mortars and rolls of the character referred to so that the roll and mortar of each pair will accurately lit together and to provide apparatus for accomplishing this `end quick yaand easily. Another object is to produce the desired finish on the coperating surfaces of the roll and mortar; Still other objects will be evident from the following detailed description of one embodiment of my invention.

Figure l is a. side elevation of the ,grinding machine;

Fig. 2 is an end elevation of the machine viewed from the right of Fitz. l, parts being omitted;

figr. 3 is a section on line SW3 of Fig. l; and

lip;n Ll is a perspective View of the block to be ground.

The stone block B illustrated in Fig. Il i first provided with a concave cylindrical upper surface S and corrugations C are then cut. in the upper surface in the direction of th. curvature of the surface. These operations may be performed in any suitable mann ner, the corrugations C preferably beine, roughed out by hand. As' shown in Fig. a the cornugations do not extend to the edges of the yblock but terminate somewhat short of the ends so that in using,r the blocks the Ychocolate will be confined to the corrugated surface. Likewise the corrugations in the -roll R aretirst roughed out by hand or in other suitable manner. After the corrugations are roughed out on the roll and mortar respectively the two parts are ground together, as will be described hereinafter, until the corrugated surfaces are smooth and until the corrugations.intermesh accurately.

rlhe machine forming the subject matter of the present invention comprises, in ,freneral, a horizontal supporting frame l, an

oscillatory frame 2 dependingr therefrom, the frame 2 benin iournaled on Athe horlzontalV frame l by means'of bearings 3, a rotatable shaft 5 journaled in the lower end of frame 2, a longitudinally adjustable link 6 for oscillatinp; the frame 2, a motor 7 for drivingr the parts and transmission mechanism hereinafter described, for connecting the motor with the operative parts of the machine. The roll R is fixedly mounted on shaft 5 which extends through an axial openinar in the roll. The block B may be supported in any suitable manner but when composed of granite or other stone it is relatively heavy and is therefore preferably supported on a carriage 8 mounted on the track 9 so that the block can be readily moved into and out of position beneath the roll R.

The depending` frame 2 comprises two bars 11 and l2 connecting,T at their upper ends to bearings 13 andf'ltt which are rotatably supported on the shaft 15, the shaft l5 being jollrnaled in the bearings 3. At the lower end thearms ll and 12connect with bearings 16 and 17 which rotatably support the shaft 5 upon which the roll R is fixcdly mounted. The two arms 1l and 12 are joined together near their lower ends by two cross bars 18 and 19, the link (i beineT connected to the center of the bar 19. PulleysQO and VV21 are fastened to the outer ends of shaft 5 and pulleys 22 and 23 are fastened to the outer ends of the shaft 15 and belts 24 and 25 conneet together the pulleys of the two sets. At the center of the shaft l5 is mounted a pulley 2G which serves as the driving pulley for shaft 15.

Power is transmitted to the pulley 26 from leys 27 and 28 mounted on a counter shaft 29, the pulley 27 being connected to the mo tor by means of a belt 30 and the pulley 28 being connected to the pulley 26 by means of a belt 31. Power is transmitted to the link 6 from the counter shaft 29 through the medium of belt` 32, pulley 33,^shaft 34, pinion 35, gear wheel 36, shaft 37, and wheel 38, the wheel 38 having a crank arm 39 ,pivotally connected to the end of the link 6.

The supporting frame 1 for the oscillatory frame 2 carrying the roll R is preferably comprised as follows: The frame 1 is supported at one end on the uprights 40 and 41 by means of a shaft 42 extending through slots 43 and 44 in the uprights 40 and 41,

the horizontal frame 1 having plates 45 and 46 bolted to its opposite sides and the plates 45 and 46 having openings therein to receive the shaft 42; and the opposite end of the frame 1 is supported on the superstructure 47 by means of a screw 48 which is threaded through the hori'ontal member .49 of the superstructure and which is provided atits upper end with a collar 50 having an annular groove therein to receive the plate 51 fastened to the lower side of the cross beam 52 extending between the longitudinal beams The operation of the machine is as fol lows: The roll R and block B having been roughed out as previously described are brought into the position shown in Figs. 1 and 2, with the corrugations on roll R intermeshing with the eorrugations on block B. VU pon starting the motor 7 the roll R is ro- 'tated through the medium of belt 30, pulley 27, sha-ft 29, pulley 28, belt 31, pulley 26, shaft 15, pulleys 22 and 23, belts 24 and 25, pulleys 20 and 21 and shaft 5,; and the frame 2 is oscillated to and fro bythe link 6 as the wheel 38 is rotated. As the roll R is simultaneously rotated and oscillated to and fro' over the surface of the block B the corrragations on the roll and block are gradually smoothed off .and rendered uniform and even, iron sand and emery powder being successively applied to the surfaces of the roll and block during the grinding process.- As the rough corrugations in 'the roll vand block are gradually smoothed down it is Anecessary gradually to lower the roll and this may be accomplished either manually or automatically. Y

The manual method of feeding the roll downwardly consists in allowing the shaft 442 'to rest in the bottom of the grooves 43' and 44 at all times and gradually lowering the right hand endfof the horizontal support 1 by means of the hand Wheel 53 on screw 48. The automatic method of feeding the roll downwardly during the grinding operation consists in pulling the right-hand end of support 1 downwardly by means-of screw' 43. with the roll R resting on the block B, until the shaft 42 is lifted from the bottonriof the slots 43 so that the entire Weight of the roll R, depending frame 2, horizontal support 1, etc., urges the roll against the block. lVith the parts thus adjusted the shaft 42 gradually settles in the slots 43 and 44 as the corrugations are ground down and by properly adjustingI the wheel 53 the cutting operation can be automatically stopped when the shaft 42 reaches the bottom of the slots 43 and 44.

A salient advantage of the support co1nprising shaft 42 resting in slots 43 and 44 is that should the roll R strike an abnormal projection on the block B the shaft 42 can move upwardly in slots43 and 44 and thus permit the roll to ride ove]` the protubcrance, thus avoiding injury to the roll or other parts of the machine. Moreover the slot connection permits the roll to be lifted while theblock is being positioned thereunder.

When feeding the roll R downwardly by the automatic method above described it will be observed that the frame 1 and the parts carried thereby are supported wholly, on the block B and that the frame 1 is fixedly attached to the superstructure only at the center of its right-hand end by means of screw 48. Any tendency for the frame 1 to tip laterally about the end of the screw 48 is counteracted by the corrugations in roll R extending into the grooves in block B. Moreover owin r to the fact that the frame 1 is otherwise ree to tip laterally about the supporting screw 48 the eorrugations on the grinding roll R automatically adapt themselves to the grooves in the block B.

While I have described the present invention for use in grinding a stone block and astone roller, 1t is to be understood that it may be used to grind or otherwise cut other materials and that while the roll and the block have been described as mutually grinding each other the parts couldl be so constructed that one part would grind or otherwise cut the other part without being materially affected itself.

What I claim is:

1. In a grinding machine of the character described, the combination of a horizontal member, an arm depending from said member, a bearing for pivotallyy connecting said arm to said member, means to oscillate said arm to and fro in said bearing, a grinding roll rotatably mounted on the lower end of said arm, means to rotate said roll while the arm 1s swinging to and fro, and a vertical guideway for said member, the member be ing vertically movable in said guideway so tha-t said roll may be raised and lowered into position .on the stock and so that the roll is ield against the stock by gravity during the grinding operation.

2. In a grinding machine of the character described, the combination of a horizontal member, anarm depending from said Laaoaasaid arm to said member, means to oscillate j said arm to and fro in said bearing, a grind- -roll is held, against the ing roll rotatably mounted on the lower end of said arm, means to rotate said roll While the arm is swiugingtoand fro, means for supporting said member ou one side of Said bearing, and a vertical' guidieway for said member' on the other viside of said bearing, whereby when. the `grinding roll is positioned upon suitablyil prepared stock' the stock and automatically advanced into the stock by gravity.

3. The method ofvproducing a grinding roll and moi-tar with corrugations which acourately interrnesh with each other conm prisng first roughing out eomplemental tra eorrugations in the roll and mortar and then, rolling the roll to and fro over the motar with the corrugations in the roll and mortar intermeshing until "the corrugations are Worn accurately to ntariit.

4. The method ourately intormesh with each other comprising first roughing out oomplemental corfu gations .in the roll and mortar,"movin,9; the roll to and` fro over the mortar with the cor- .rugations in the ing, and rotating the roll as it 1s moved haeltA and forth over the mortar.

Signed by ine at Montpelier. Vermont, this 30th day o July, 1918.- RBERT B. JONES.

of producing a grinding 'roll and mortar with eorrugations whleh aoroll and mortar intaiuieal'in 

